Tool for applying coating.



H. W. DAY. T001 FOR APPLYlNG COATING. APPLICATION FILED OCT. 26. 1915.

Patented Feb. 15, 1916.

a ll

I an sTaTns PATENT @Turina HERBERT W. DAY, 0F WOLLASTON, MASSACHUSETTS, ASSIGNR T0 'THE SPRAY ENGINEERING CQMPANY, OF BOSTQN, MASSACHUSETTS, A CORIEORATION 0F MAINE.

Toor. roza APPLYING comme.

Specification of Letters Patent.

Application filed October 26, 1915. Serial No. 58,035.v

lcoating, if a\liquid, may be a paint, japan,

varnish, or other Vsuitable coating medium, or it 'may be a solid in powdered form, and the material to which it is to be applied may be of any character, such, for example,

as wood, metal or other material.

One important object of theinvention 1s 'to provide an industrial tool which may be readily used in rough or rugged work not requiring a great nicety of manufacture nor costly and delicate parts.

A further object of the invention is to 'provide a iilm formed and maintained by capillary actionl and brokenandprojected by fluid underpressure.

Other objects of the invention will be set forth hereinafter.

Referringmore particularly to the drawing, wherein I have represented -a single embodiment of my invention: Figure 1 is a y side elevation of a tool constructed in ac.

ing lever is of general trigger form,but such construction ymay be Widely varied within the scope and purpose of the invention. The

body 1 of the tool is provided with a passage 3 for air or other suitable iluid under pressure and with a passage 4 for the paint or other coating liquid or powder, which also may be supplied under suitable pressure if desired, or through gravity. To this end I have provided supply pipes 5 and 6, tapped into the passages 3 and 4 as represented in F ig. 2.

Controlling the air supply passage 3 is a valve, which may be of any suitable form but which is herein represented as an aXially movable member 7, positioned within a valve casing 8, tapped into the body 1 at 9. The said casing 8 is provided with a suitable passage 10 for the entrance ofthe air, `and with a discharge passage 11 through which the air may enter a passage 12 herein represented as leading in an inclined direction to a through passage 13,

.wherein is positioned a needle valve 14 threaded at l5 for adjustment and provided with a knul-led adjusting disk or member 16. The said valve7 is normally held closed by a coiled spring 17, positioned between a washer 18 and the inner surface of the valve casing 8. The inner portion of the said valve 7 is tapered as indicated at 19, and said valve vis provided with an axial prolongation 20, of spindle or pin like form, extending into a recessed portion 21 of the operating valve 22 mounted within a suitable recess 23 in the body 1 of the tool and having the operating lever 2 previously referred to.

The liquid or otherI coating supply passage 4 is controlled by a valve, preferably generally similar in construction and mode of operation to the valve that controls the air supply. Herein for the purpose I have represented a valve casing 24, having a port 25 for the discharge of the coating material, and a smaller port 26A through which said material enters the valve casing. Said port 26 is controlled by a valve 27, preferably of a construction similar to the valve 7 and normally held closed by a coil spring 28. The said valve 27 is provided with an axial extension 29, entering. a recess 30 of the operating valve 22.

The construction and operation are such that upon movement of the operating lever 2 in the proper direction the valves 7 and 27 are opened so as to discharge air and coating material through the valve casings `8 and 24. If desired, I may provide means to adjust or vary the lengths of the extennsions 20, 29, so as to adjust the sequence of the opening of the valves 7, 27. lrVhile I may so adjust the parts that either of said Patented Feb. 15, 1916.

I,valves is opened first, I preferably so construct the parts that the valve controllingl ,valve casing 31, here shown as, having a threaded portion 32 tapped into the recessed portion 33 of. the body. The said valve casing 31 is provided With a tapering discharge passage 34 controlled by the said p needle valve 14.

Outside of the valve casing 31 is a member 35,`herein shown as having a concaved or curved inner surface 36 and a small eentral opening 37 in line with the axis of the needle valve 14. Said needle valve 14 also controls the said opening 37. The said member 35, Which may be of general caplike form, is herein represented as internally threaded at 38, and as received upon the-externally .threaded portion 39 of the tool body. The length of the threaded portion 39 is sufficient to permit adjustment of the member 35 and I preferably provide a lock nut 40 in the rear of said member 35 to maintain a fixed adjustment and to prevent leakage by compressing the threads 39.

The interior of the member 35 is in communication with .the interior of -the valve easing 34 by means of a passage 41.

If desired, and as herein shown, the. tool body 1 may be provided with a supporting hook 42 of suitable formation and herein represented as integral with the body of the tool.

The coating material entering the member 35 forms a film upon the inner surface thereof, and the thickness of this film may be very readily varied by adjustment of the member 35. Such film is constantly formed and maintained by capillary action between 'the two surfaces which are brought close enough together to insure suchaction. The air entering through the passage 3 breaks through the film at the central portion of the cap and discharges the same upon the Work in very fine globules. Said film is constantly broken by the air or other blast, but is constantly restored through the action of capillarity. Hence the coating material may be merely1 under suction due to capillary action. The maintenance of the supply of coating material is not dependent upon the presence of the air blast which is used merely to break the film and discharge theV globules. If desired and preferably I ernploy heated air or a heated gas ofany suitable kind entering the same through the.v

passage 3, and if desired ,a heated coating material may be employed.

'I effect through the described construction a very fine division of the coating material, lthe fineness of the division thereof depending upon the velocity of the air or gas entered/through the passage 3. The said blast of air or other gas carrying with it the coating material in fine globular fo'rm, effects a laying of the fibers of the Work particularly if the latter be Wood and also effects a drying of the applied coating. For this reason I am enabled to dispense With the preliminary sanding of Wooden surfaces.

Having thus described one illustrative embodiment of my invention, I desire it to be understood that although specific terms are employed, they are used in a generic an'd descriptive sense and not for purposes of limitation, the scope of the inventiori being yset forth in the following clams.

Claims:

1. Means for applying coating comprising means for maintaining a film, and means.

for breaking through and discharging said film, the film maintaining means being relatively located with respect to the film discharging means so as to supply a film substantially transverse to the direction of movement of the film v'breaking and discharging means.

2. Means for applying coating comprising means for continuously maintaining a filml through capillarity, and valve-controlled means for breaking through said film and discharging the same in a stream v against the surface to be coated, the film maintalmng means being relatively located ,with respect to the film discharging means so as to supply 'a film' substantially transverse to the direction of movement of the film breaking and discharging means. 3. Means for applying coating comprislng means for maintaining a film of coating material, and means for applying fluid under pressure to and discharging said film in a stream, the film maintaining means being relatively located with respect to the flow of the stream of filmdischarging fluid so 'as-to supply a film substantially transverse to the direction of said flow at the film.v

4. Means for applying coating comprising means for maintaining a film of coating material, and means for projecting a stream of fluid under pressure against said film, the film maintaining means being relatively located with respect to the flovv7 of the stream of film discharging fluid so as to supply a film substantially transverse to the direction of said flow at the film.

l5. Means for applying coating comprising means for maintaining a film of coating material, and means for projecting a stream of fluid under pressure against a limited area of said film and for discharging images means being relatively located with respect` to the flow of the stream of film discharging fluid so as to supply a film substantially transverse to the direction of said flow at the film.

6. Means for applying coating comprising a plurality of' members having surfaces in juxtaposition, means for introducing coating material between said surfaces, in quantities substantially sufficient to form a film between said surfaces, and means for projecting a stream of film under pressure through said members and through said film, thefilm maintaining means being relatively located with respect to the flow of the stream of film discharging fluid soas to supply a film substantially transverse to the direction of said flow at the film.

7. Means for applying coating comprising a pair of members having surfaces in juxtaposition and apertured for the discharge of coating material, means for supplying coating material between said surfaces, in quantities substantially sufficient to form al film between said surfaces, and means for projecting a stream of fluid under pressure through said apertures and through the film maintained between said surfaces, the film maintaining means being relatively located with respect to the flow of the .stream of film discharging fluid so as to supply a film substantially transverse to the direction of said flow at the film.

8. Means for applying coating comprising two cap-like members having surfaces in juxtaposition and apertured for the discharge of material, valve means controlling said apertures, meansfor supplying coating material as a film betwen said members, and means for discharging fluid under pressure through the film and said apertures.

9. Means for applying coating comprising a body having superposed caps having their adjacent surfaces in close proximity and perforated for the discharge of coating material, valve means governing said perforations, means for supplying material as a film between said caps, a valve controlling the supply of said means, means for pro jecting fluid under pressure through said perforations, and a valve controlling said latter means.

10. Means for applying coating comprising a body having a cap-like member adjustably mounted thereon and perforated for the discharge of material, an inner cap mem- Y es, @a

ber in proximity tothe outer cap member Vand having a perforation, valve means controlling said perforations, means for introducing coating material between said caplike members at one side of the axial center thereof, and means for introducing fluid Ender pressure axially of said cap-like memers.

11. A tool for applying coating comprising a body having inner and outer cap-like members, each centrally perforated and having surfaces in juxtaposition, a valve controlling said perforations, a passage leading through the interior of the inner member, a passage leading to a point between said members, valves controlling said passages and cooperating means whereby coating material is supplied as a film between said members.

12. A tool for applying coating comprising a body 1 having cap-like, perforated members 31, 35, a-valve 14 controlling said perforations, passage 12 for supplying fiuid under-pressure, and passage 41 for supplying coating material as a film between said members, and valves 7 and 27 controlling said passages.

13. Atool for applying coating comprising a body 1 having cap-like, perforated members 31, 35, in sufficient juxtaposition to permit the supplying of the coating ma.- terial as a film between said members, a valve la controlling said perforations, passages 12 and 41 for supplying fluid under pressure and coating material,` valves 7, 27 controlling said passages, and a single means 2 for operating said valves 7, 27.

14. A tool for applying coating comprising a body 1 having adjustable, perforated cap-like members 31, 35, in sufficient juxtaposition to permit the supplying of the coating material as a film between said members, a needle valve 14 controlling said perforations, means for varying the distance between said cap-like members, passages 12 and 41 for supplying air under pressure and coating material to said cap-likev members, valves 7, 27 controlling said passages, and an operating lever 2 for said valves.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

HERBERT W. DAY.

Witnesses:

ROBERT KAMMLER, F. RENE CHANDLER. 

